cool your solution made the field height in User Register -> Additional Information field height about half the height of vBulletin User Register Fields for email address fields and did not effect those. It also did not have any effect on the Single - Selection Menu in Additional Information.
vBulletin seems to have a center and field height problem in other parts of their program too.
Note on my User Profile Page the centering problem
vBulletin Forum Register Page has the same problem